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    <p>If you want to call only one function, use a command line parameter which you get via argv/argc.</p> <pre><code>int main(int argc, char *argv[]) { if (argc != 2) return -1; // zero or 2+ commandline arguments if (0 == strcmp(argv[1], "function1")) function1(); else if (0 == strcmp(argv[1], "function2")) function2(); else { return -1; /* error */ } return 0; } </code></pre> <p>What happens behind the scenes (before main() is called), a partial list:</p> <ul> <li>OS creates new prrocess and executes it's entry point address (not main()).</li> <li>Entry point function receives all command line arguments from the OS in some OS dependent manner.</li> <li>Various C std library are called to initialize the framework.</li> <li>Environment variables are copied to std C library structures.</li> <li>Dependent DLL's are loaded.</li> <li>Globals are initialized.</li> <li>An array of char* is created (argv). Each array entry points to a C string. The first (argv[0]) is always the exe name. If the OS/shell have passed command line arguments, they are copied to argv[1], argv[2], etc.</li> <li>main(int, char**) is called with argv and argc.</li> </ul> <p>All this work is done to abstract the OS from the program. The above flow is heavily OS dependent and doesn't interest most developers. When you're an (very) advanced C programmer or if you take an interest in this flow then you can read on your own.</p> <p>main() prototype is defined by the C standard. Actually there are several legal prototypes to choose from. The compiler/linker will choose what you implement.</p>
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    1. POCalling different User Define Functions in C
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    1. COHow does the strcmp function exactly works? All I know is that it compares bytes and returns a negative or positive value.
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    2. COrobably a better question is how does each part in this command line parameter work? Also for the else if for function2, would it matter if it were a void function?
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    3. CO@GhostMember - strcmp subtracts chars from str1 by str2, the first non zero is returned. Positive number is left is higher, negative right is higher and zero for equal.
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